The metal cerium is never found isolated and this drug contains in addition the oxalates of at least the two metals- lanthanum and didymium.
The old school use Cerium oxalate “to restrain vomiting arising from various causes, especially from pregnancy” (Bartholow). They do not seem especially enthusiastic over it, contenting themselves, seemingly, with the thought that if it does no good, it does not make the patient worse.
It has not been proved and we are not apt to use it except when other remedies fail.
Halo says: “My experience with it is that in the worst cases of vomiting of food, half-digested matters, mixed or not with blood, with great pain during or after vomiting, It sometimes affords relief. I have obtained the best results from the 1st decimal trituration.”.